KDP categories · Top KDP authors
PrepMaster Digital: Amazon KDP author data
As of Nov 6, 2026, PrepMaster Digital has 89 books on Amazon, 9 of them on a best-seller list in the last 30 days (best rank #1), mostly in Teaching, Certification & Development, Education.
| Median price | $29.99 |
|---|---|
| Price range (middle 50%) | $19.99 – $39.99 |
| Median reviews | 14 |
| Total reviews | 1,097 |
| New listings (30 days, incl. new editions) | 9 |
| Breakout books (30 days) | 3 |
What stands out
- Only 10% of the catalog charted in the last 30 days; sales rest on a few titles.
- Median price $29.99, 18% below the median of their main category, Teaching.
- 9 new listings in the last 30 days (new editions included), 3 of them broke into a Best Sellers list.
PrepMaster Digital's best-ranked books
-
Independent NYSTCE Multi-Subject 221 222 245 Study Guide: 1464 Practice Questions Across 12 Full-Length Tests, Detailed Answer Explanations and Complete Content Review for All Three Parts
by PrepMaster Digital
- Price$19.99
- Rating4.9
- Reviews20
- Published2026-10
-
Independent Praxis Business Education (5101) Step-by-Step Study Program: Systematic Expert-Driven Review, 840 Practice Questions with Detailed Explanations, Covering All 8 Content Domains
by PrepMaster Digital
- Price$34.99
- Rating4.9
- Reviews13
- Published2026-10
-
Independent Praxis 5123 Study Guide: 910 Practice Questions Across 7 Full-Length Tests, Step-by-Step Explanations and Complete Content Review for All Six Domains
by PrepMaster Digital
- Price$39.99
- Rating4.7
- Reviews12
- Published2026-08
-
Independent SLLA 6990 Study Guide: 1560 Practice Questions Across 13 Full-Length Tests, Detailed Answer Explanations, Comprehensive Content Review and Constructed Response Strategies
by PrepMaster Digital
- Price-
- Rating4.3
- Reviews32
- Published2026-10
-
Independent NREMT Paramedic Practice Tests and Domain Review: 1,500 Practice Questions Across 10 Full-Length Tests, Detailed Answer Explanations and Full Content Review
by PrepMaster Digital
- Price-
- Rating4.8
- Reviews29
- Published2026-09
-
Independent Praxis Middle School Mathematics 5164 Study Guide: 1320 Questions Across 20 Full-Length Exams with Detailed Explanations for Aspiring Middle School Math Teachers
by PrepMaster Digital
- Price-
- Rating4.7
- Reviews28
- Published2026-10
-
Independent NREMT Advanced EMT Practice Tests and Clinical Reasoning: 1,350 Practice Questions Across 10 Full-Length Tests, Detailed Answer Explanations and Full Content Review
by PrepMaster Digital
- Price$29.99
- Rating4.9
- Reviews27
-
Independent CTEL Study Guide: The All-in-One Exam Prep with 900 Practice Questions, 6 Full-Length Tests, Detailed Explanations and Complete Content Review
by PrepMaster Digital
- Price-
- Rating4.8
- Reviews24
- Published2026-09
-
Independent NCE Study Guide: The Complete 30-Day Plan with 1600 Questions, 8 Full-Length Tests and High-Yield Content Review
by PrepMaster Digital
- Price-
- Rating4.6
- Reviews24
- Published2026-10
-
Independent TExES ESL 154 All-in-One Study Guide: Complete Content Review, 7 Full-Length Practice Tests with 560 Questions and Detailed Explanations to Master Every Domain
by PrepMaster Digital
- Price-
- Rating4.9
- Reviews24
- Published2026-08
Main categories
FAQ
How many books does PrepMaster Digital have on Amazon?
KDPTop tracks 89 of their books; 9 made an Amazon list in the last 30 days.
Which categories does PrepMaster Digital publish in?
Their books chart most often in Teaching, Certification & Development, Education.
How does PrepMaster Digital price their books?
The median price is $29.99; half of the books cost $19.99–$39.99.
Has PrepMaster Digital released new books recently?
9 new books in the last 30 days, 3 of which reached a Best Sellers list.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.